Oil burner pumping unit



Original Filed March 8, 1948 R. R. WITHERELL OIL BURNER PUMPING UNIT 4Sheets-Sheet l g- 1952 R. R. WITHERELL 2,606,497

I OIL BURNER PUMPING UNIT Original Filed March 8, 1948 4 Sheets-Sheet 2I IAINVENTOR. 72;? 2?; Wfz lkerall.

"Bygj Aug. 12, 1952 R. WITHERELL OIL BURNER PUMPING UNIT Original FiledMarch 8, 1948 4 Sheets-Sheet 5 IVINVENTOR. Faierz F, lflz'f/l axzll JJWg way 4 Sheets-Sh eet 4 x A I 43 R. R. WITHERELL OIL BURNER PUMPING UNITAug. 12, 1952 Original Filed March s, 1948 Patented Aug. 12, 1952UNITED-STATES PATENT OFFICE Robert R. Witherell, Bloomington, Ill.,assignor to Eureka Williams Corporation, Bloomington, 111., acorporation of Michigan Continuation of application Serial No. 13,718,March 8, 1948. This application October 4, :1951; Serial No.:2.49,727

. 1 This inventionrelates to a pumping unit for supplying fuel and airto oil burning apparatus and has particular relation to the constructionand assembly of the various elements of saidunit within and upon acasing for such elements and the construction and assembly of the casingin cornbinaticnwith other unitsof such oil burning apparatus.

Some of the-objects of the invention are to provide: 7 v

A pumping unit for oil burning apparatus which consists of elements thatareeasy to construct and to assemble within a single unit that can beattached to and made a part of the complete oil burning apparatus.

A pumping unit which issimple in construction and easy to adjust, toassemble, and to service.

A pumping unit which is quiet in operation and which will not giveoffobjectionable .oil fumes into the surrounding atmosphere.

A pumping unit in which novelmeans .is provided for assembling all ofthe elements of the unit within a pumping unit casing and for aligningthe same with drive shaft means and other elements of the complete 011burning apparatus.

A pumping unit in'which novel .air pump, fuel pump, and fuel meteringpump constructions are employed.

Other and further objects of the invention will be apparent by reference.to the accompanying drawings of which there are four sheets, which, byway of illustration, show a preferred embodiment and the principlesthereof and whatjI now consider to be the best mode in which .I havecontemplated applying these principles. Other embodiments of theinvention embodyingv the same or equivalent principles may be used andstructural changes may be made as desired by those skilled in the artwithout departing from the present invention and the purview of theappended claims. I also contemplate that of the several differentfeatures of my invention, certain ones thereof may be advantageouslyemployed in some'applications separate and apart from the remainder ofthe features.

Referring particularly to the drawings:

Fig. 1 illustrates a longitudinal sectional view with certain partsthereof in elevation of a .part of an oil burning apparatus, includingtherein a pumping unit embracing the principles of the invention.

Fig. 2 is a cross-sectional view through a portion ofthe structureillustrated by Fig. 1 adjacent the fuel pumpingmeans which is employedin the structure. Fig. 2 istaken-on line 2-2 of Fig. 1 looking in thedirection of the arrows. v

Fig. 3 is another cross-sectional view" through the structure disclosedby Fig. 1 illustrating the 14 ,Claims. (Cl. 103-5) fuel pumpingmeansemployed in such structure. Fig. .3 is taken substantially in the planeof line 3-3 of Fig. 1 looking in the direction of the arrows.

Fig. 4 is a cross-sectional view through the fuel metering meansemployed in the structure disclosed by Fig. 1. Fig. -4 is takensubstantially in the plane of line 4-4 in Fig. flocking in the directionof the arrows. 1

Fig. 5 is a cross-sectional view through the structure disclosed by Fig.1 and through one of the end plates for the air pumping means includedtherein. Fig. 5 is taken substantially on the plane of 5-5 on Fig. 1.

Fig. 6 is a cross-sectional view through the air pump structure employedin the pumping unit disclosed by Fig. 1. Fig. .6 is taken substantiallyin the plane of line .66 on Fig. 1.

Fig. 7 is another cross-sectional view through the other of the air pumpend plates and the fuel cleaning compartment embraced in the pumpingunit. Fig. '7 is takenysubstantially in the p e of e -1 lookingin thedirection of the .arrows thereon.

Fig. 8 is a schematic illustration of certain parts of the oil burningapparatusin which the pumping, unit embracing the principles of thisinvention is employed.

Referring to Fig. 1, the numeral 10 indicates a portion of a motorcompressor unit employed in the oil burning apparatus .with which thepumping unit indicated by the numeral H is adapted to be employed. Themotor compressor unit It includes a shaft I2 which is adapted to bedriven by an electric motor, not shown, and on which ismounted .a fan,not shown. The fan referred to supplies the main quantity of secondarysupply of .air employed ,in the fuel burning apparatus. The motorcompressor unit It! with which the pumping unit H is employed may be amotor compressor unit such as that disclosed incopending applicationSerial No. 772,970, filed September 9, 1947, for Motor Compressor Unit,rl ggii Patent No. 2,542,121, issued February .20,

The numeral 13 indicates an inlet .portion of the housing .for the fanemployed in the motor compressor unit .10, the air supplying the fanbeing admitted through openings 14 which are formed within the housing[3 between circumferentialrings [6 extending about the housing. The airadmitted through the openings l4 passes into the fanthrough a fan'inletindicated by the numeral I]. v

The shaft i2 drives the pumping unit if through-a shaft-coupling [B inthe opposite end of which a shaft l9 employed in the unit .H is secured.Theshaft I9 is securedin the coupling The bearing 2| is held in a 22 bya spring and cap structure indicated by' the numeral 23.

23 is held in position against the end of the end plate 22 by screwsindicated at 24.

In order to properly center the bearing 2| and the shaft |9 with respectto the housing I3, there;

is provided within the housing |3 an axially disposed cylindricalopening indicated at 26. The opening 26 is adapted to receive theexterior surface 21 of the end plate'22 and to form a close sliding fittherewith in order to locate the plate 22 with'respect to'th'e end ofthe housing l3 and drive shaft |2 of'the oilburningapparatus I0. Thehousing |3 also is provided with an axially extending cylindrical flange28 which'projects from the end of the" housing I3 in such a way that theend surface 'o'f-the flange isdisposed normal with respect to the axisof the cylindrical surface 26. The flange 28 is adapted to provide aseating surface against which the endof a similar cylindrical flange29formed on ahousing 3| for the pumping unit is seated. The housing 3| isgenerally cylindrical in formation except for the projection'from theupper central portion thereof of a projection indicated-at 32 and withinwhich a'chamber 33 is provided for a liquid fuel cleaning device 34.'Formed across the central portion of the'casing 3| and disposed intransverse relation 'to the axis thereof is a web or support indicatedat'36 which is provided with a centrally disposed opening 3f! throughwhich shaft |9projects.

Disposed on the side of the support 36 adjacent the apparatus I is arotary vane compressor indicated generally at 38. The compressor 38 (seealso Figs. 5,6, and 7) comprises an end cap 39, a compressor cylinder4|, and the end cap 22 previously referred to. Within the cylinder'4lthere is provided an eccentrically disposed pumping chamber 42 which isadapted to be engaged by the ends of blades or'vanes 43 which aredisposed radially within slots 44 formed in a rotor 46 securedconcentrically with respect to shaft l9. In order to provide for theaxial movement of the shaft |9 with respect to the rotor 46,'the shaftI9 is provided with anarcuate depression indicated at 41 in which a ball48 is adapted to be seated. Rotor 46 also is provided'with a pluralityof axially disposedgrooves 49 extending between the opposite endsurfaces thereof, one of which receives the ball 48. It willbe apparentthat the ball 48 is free tov move with the shaft l9 within its groove49..

In order to provide means for properly aligning the variousparts of thecompressor 38 within the casing 3| and the casing 3| with respect to thehousing l3, there is provided within the end of the casing 3| withinwhich the compressor 38 is received a plurality of radially disposed,inwardly projecting, longitudinally extending guides indicated at Theexterior surface of the end caps 22 and 39 are formed of such a diameteras to slidably fit the inner surface of the guides 5|, and the cylinder4| 'is' provided with a radially disposed projection 52 likewise adaptedto slidably engage the'inner surfaces of the guides 5|.

Disposed beyond the support 36 within the The spring and cap structure M4 casing 3| is a fuel supply pump indicated generally at 53 and a fuelmetering pump indicated generally at 54 (see Figs, 2, 3, and 4) The fuelsupply pump 53' consists of a pair of end plates 56 and 51 between whichis located a cylinder block 58. Formed as a part of the end plate 51 isa metering pump block 59 beyond which is a metering pump end plate 6|.The end of the casing 3 containing the fuel supply pump 53 and themetering pump 54 is similarly provided with longitudinally disposedguide rails 62 within which the various elements of the fuel supply pump53 and. fuel metering pump 54 previously referred to are adapted to beslidably disposed.

In order to secure all of the various elements of the air pump 38, thefuel supply pump 53, and the fuel metering pump 54 together within thecasing 3|, and-in order to secure the casing and its various elements tothe housing |3, there is provided a plurality of securing means to behereinafter described and by the employment of which the variouselements of the'structure are successively secured to" on another andthe entire structure secured to the housing |3'.- One of such securingmeans is a plurality of machine screws indicated at 63 which extendthrough openings 64 formed in the support 36 in such manner that thefuel supply pump end cap 56 may be secured by such bolts to one side ofthe support 36 while the end caps 22 and 39 and the cylinder block 4|are secured to the oppositesurface of the support 36. It will be notedfrom Fig. 1 that the end cap 22 has threadedopenings; 65, formed thereinfor receiving the threaded ends of the screws 63 while the end cap 56has countersunk openings 66 extending thereacross for receiving theheads of the bolts 63. It will be noted from Fig. 6 that the cylinderblock 4| is provided with relief openings indicated at 61 for receivingthe screws 63, these relief openings being larger than the studs so asto permit proper positioning of the cylinder block within the guides 5|.From Fig. 7 it will likewise be apparent that the end cap 39 is alsoprovided with relief openings indicated at 68 which are also larger thanthe screws 63 for a similar purpose.

It will be apparent that when the end cap 56 is positioned on one sideof the support 36 and the end cap 39, the cylinder block 4| and the endcap 22 are'positioned upon the opposite side of support 36, all of suchelements being properly positioned within the guides 5| and 62, that thescrews 63 then may be inserted in the various openings and all of theelements referred to will be properly assembled upon the support 36.

Thereafter the entire casing structure may be assembled upon the housingl3 by the employment of machine screws indicated at 69. In order to beable to employ the machine screw '69, there is provided in the housingI3 within the annular flange 28 countersunk openings, indicated at Hwhich are formed in the housing in such manner as to be insertable fromthe interior of the housing i3. By referring to Figs. 5, 6, and lit willbe noted that the distance between the openings provided for the machinescrews 69 is greater than the diameter of any of the elements of the airpump 38 so that the machine screw extends through the casing, 3| outsideof the elements of the pump 38. ,Howeventhe support 36 is provided withenlarged bosses indicated at 12 and in which openings are provided forreceiving T-nuts 13 in which the inner ends of the machine screws '69are threaded. When'the machine screws 69 are properly secured within theopenings H and acorns? with respect to the-housing I3 by the. machinescrew 59 and that the elements of the air pump 33 and the casing 3| willbe centrally located with respect to the housing I3 by the end cap 2-!and the guide rails 54 Thereafter by the employment of machine screws74, it is possible to properly position within the casing 3| and tosecure therein upon the support 35 the various elements-of the fuelsupply pump 53 and the cylilder block 59 for the fuel metering pump 54.In order to provide for such assembly, end plate 55 is provided withthreaded openings indicated at It, the fuel pump block 58 is relieved asindicated at TI, and the metering pump block and end plate 59 isrelieved as indicated at it. Thereafter when the blocks 55 and 59 havebeen properly positioned within the guide rails 62. the machine screws14 are positioned within relief openings TI and I8 and tightened withinthe threaded openings i5. I

Thereafter the metering pump and bloci: may

be secured upon the metering pump block 59 by the employment of screwsindicated ate l.

The remaining endof the shaft I9 is rotatably securedin a sintered,powdered, metallic, selfaligning bearing 82 which is adapted tobemovably supported within a bearing support surface 33 formed in theendplate 56. The bearing 82 is held against the surface 83 by a springand cap structure indicated at 84 which is secured rigidly between thecap '6 and the support .35. The opening 3! provided in the support 35 isadapted to be clos'edby a fluid-tight seal indicated at-86, thelatterconsisting of a rotating element 81 and a stationary element '88.Referring particularly to Fig. 8, it will be noted that the rotatingelement 31 comprises an internally flanged cap 89 in which a resilientsealing member 9-I is disposed around the shaft I9. "The opposite end ofthe sealing member is reinforced by a collar 92 engaging a ring 93disposed within a circumferential opening formed with the shaft I9. Thestationary element 88 of the seal 86 comprises an annular sealing member94 adapted to run against the adjacent end of the member 89 and 'beingsupported upon a flanged sleeve indicated at 9B. The flanged portion ofthe sleeve 95 is engaged by one end of a spring 91, the opposite end ofwhich is disposed against the end surface of an opening 98 formed withinthe end cap 39.

The flanged sleeve 95 also is movably supported by a flexiblediaphragmindicated at 99, the inner periphery of which is secured between theflanged portion of the sleeve 96 and the adjacent surface of the sealingring 54. The outer periphery of the diaphragm 99 is secured regidlybetween the end cap 39 and the adjacent surface of the support 36.

Further, .it will be noted; that the annular space around the.pumpingnunits: onopposite sides of the support are. in opencommunication through the enlarged openings r64 through which themachine screws 63 extend.

; Referring now particularly to 8', it will be noted that the pumps'38., 53, and 54 are connected by ;various internally and externallyformed passagesgto the nozzle I03 of the oil burning apparatusJI-Il.Referringzparticularly to the airpump 38 it will be noted that the "endplate 39 is formed in such manner -as;to provide an inlet passage Hi4communicating with the annular space Hi5 formed between the pump 38 andthe end of the casing ;3 I between the support 36 and the housing I3. Asthe .rotor fliof the pump 38 is rotated by the shaft 19., air will bedrawn inwardly from the annular space 105 and compressed within the pump38 by the vanes 43. The air within the 'annular space I05 is admitted tothe casing 3| through a plurality of ports I96 and 561 formed in thecasing 3 l onopposite sides of the support 35. ,It will be apparent thatthe air which is, admitted through the ports. It! will be admitted to anannular space I08 formed around the elements of the fuel pump 53 and thefuel metering pump 54 and from the annular space His will be admitted tothe annular space H through the openings 64.. It will thus be apparentthat any oilv fumes which may result from the operation of the pumps 53and 54 will be drawn-into the pump 38 through the inlet I04.

The outlet or discharge .from the pump 38 is provided by a passage I09also formed within the end plate 39 and communicating with a passage IIEI formed in the support-36 and communicating with a conduit I I Ileading to the air supply passsage II2 of the nozzleil03. The passageIII] also has aby-pass indicated at 'I I3 controlled 'by an adjustableneedle valve I I4 threaded into the support 36 and accessible from theexterior of the casing '31. The by-pass II3communicates with the annularspace 'I-O8.Q"It willbe apparent that by adjusting the needle valve I I4in the by-pass I I3 it ispossibl'e to control the dischargepressure fromthe pump 38 to the air supply passage 'I'I2. However, the air whichmaybe by-pass'ed by the needle valve H4 will not be discharged into theatmosphere except through the inlet passages I06 and It! communicatingwith the annular spaces I05 and I03. The annular spaces I05 and I08therefore constitute muflle chambers surrounding the pumps 38, 53, and54 for the purpose of absorbing air or other noises incidental to theoperation of such devices.

Fuel for operating the supply "pump 53 and the metering pump 54 is'ad'aptedto be supplied through an outer fuel supply chamber indicatedat I I6 which constitutes the outer part of the'fuel supply chamber 33formed in'the'outwardly projecting portion 32 of the casing 3 I. Thechamber I I6 communicates with the oil'burning'apparatus fuel supplytank by means of athreaded opening Ill to which a liquid fuel supplyconduit, not

shown, is attached 'to the fuel tank, also not shown. Within the supplychamber 1 I6 is a filtering device or oil cleaner indicated at 34, the

filter portion I I8'thereo'f being annularin formation'and secured inthe chamber in spaced relation to the outer walls between flanges I I9and I20 projecting upwardly and downwardly respectively from the upperand lower extremities of the fuel supply chamber 33. The chamber H6 andthe filtering device I I8 are accessible'through'an end plate IZIsecured upon' th'e upper end of the pro- 7 jection 32 by screwsindicated at I22. Within the filtering device H8 is an inner chamber I23into which th oil admitted to the outer chamber I I6 is admitted throughthe filtering device I I8. The inner chamber I23 is accessible throughthe cap I2I and through an'o'pening in the cap I2I within whicha'threadedplug I24 is adapted to be normally disposed; Communicatingwith the inner supply passage I23 is an inlet conduit I26 formed in thesupport 36 and the end plate 56 and the opposite end of whichcommunicates with the fuel inlet port I2'I of the supply pump orcompressor 53. The compressor-53 within the compressor block 58comprises a pair of meshing gears I28 and I29, the latter gear beingrotatably mounted upon shaft I9 upon a ball I3I disposed in concavedepressions or openings I32 in the shaft I9. The

ball I3I also extends within one of the grooves I33 formed in the gearI29 throughout the length thereof so as to provide a universal drivingconnection between shaft I9 and gear I29. The gear I28 is mounted on anidling shaft I34 secured in an opening formed in the end plate 56. Theball I3I is free to move with shaft I9 within the groove I33 so as toprovide for axial movement of the shaft I9 relative to compressor 53.The flexible or universal driving connection between the shaft I9 andgear I29 provided by the ball I3I, and the universal connection betweenthe shaft I9 and rotor 46 of the air pump 38 provided by the ball 48,will compensate for misalignment of the shaft I9 and rotor 46 or gearI29, and will permit rotation of rotor 46 and gear I29 within theirrespective chambers without bias from the shaft I9, and rotation ofshaft I9 within its bearings without bias from rotor 46 or gear I29.

The discharge side of the compressor 53 is connected through an exhaustport I36 and an exhaust passage 'I3I to an exhaust chamber I38 formedwithin the end plate 56 and the opening 31 within which the seal 86 islocated. The exhaust passage I38 communicates with the fuel meteringpump chamber indicated at I39 through a passage I46. The exhaust chamberI38 also may communicate with the inner fuel supply passage through apassage I4I controlled by a bypass valve I42. The by-pass valve I42 isadapted to' seat in the bottom of an enlarged valve chamber I 43 forminga part of the passage MI and in which is located a spring I44 adapted tourge the valve I42 into engagement with its seat at thelower part of thevalve chamber I43. The opposite end of 'the spring I44 is disposedagainst the inner end of a threaded stud I46, the head of which ispositioned within the inner supply chamber I23 and accessible throughthe opening closed by the plug I24. In the event it is desired to havethe by-pass I,4I communicate with.the inner supply chamber I23 a studI46 having a passage indicated at M1 is employed. When such a stud isemployed, then liquid may be by-passed from the exhaust chamber I38 tothe inner fuel supply chamber I23 through the by-pass valve I 42 and thepassage I4'I. However, it may be desirable to by-pass the fuel throughthe by-pass valve I42 to the inner chamber I23. In such event a studlike that indicated at I46 is employed without the opening I4'I beingformed therein. Whensuch a stud isemployed then th liquid from theexhaust passage I38 may be by-passed directly to the fuel supply tankpreviously referred to through a passage I48 which communicates with thechamber I53 and which is adapted to be connected by a threaded openingindicated at I49 to a return conduit, not shown, but which communicatesat the opposite end thereof with the fuel supply tank.

It will be apparent that the operation of the pump 53 by the drivenshaft I9 will tend to pump liquid fuel from the fuel supply chamber I I6into the exhaust chamber I38 and the fuel metering pump chamber I39. Inthe event the liquid fuel is not exhausted from the chambers I38 and I39as fast as it is delivered by the pump 53, a certain amount or all ofthe fuel supplied by the pump 53 will be by-passed through the conduitI4I either to the inner supply chamber I23 or the fuel supply tank, notshown, this depending upon whether the passage I41 is or is not employedin the stud I46. However, the operation of the fuel metering pump 54 maytend to relieve the pressure in the chambers I38 and I39 by supplyingtherefrom metered quantities of fuel to the oil burning nozzle I03. Forthis purpose the inlet port I5I of the fuel metering pump 54 isconnected to the fuel metering pump chamber I39 by a passage I52.

The fuel metering pump 54 comprises a rotor I53 which is slidablydisposed within the metering pump chamber I39 against the inner surfaceI54 of the end plate 6I The rotor I53 is driven by a ball I56 disposedin an eccentric opening formed in the adjacent end of the shaft I9 and acentrally disposed opening formed in the adjacent surface of the rotorI53. It will be apparent that the spring 91 will exert a resilientpressure upon the shaft I9 tending to urge the shaft towards the rotorI53 for driving the rotor in a circular path against the wall I54. Theball I56 provides a universal connection between shaft I9 and rotor I53so as to insure that the rotor I53 will seat against the wall I54 andhave a sealing fit therewith. The rotor I53 has a cylindrical radiallydisposed opening I5I projecting therein in Which a piston I58 isreciprocally disposed. The opposite end of the piston I58 is receivedwithin an opening formed in a spherical bearing member I59 which ismounted for lengthwise movement and oscillatory movement within acylindrical opening I6I formed across the end of the metering pump block59 and which communicates with the metering pump chamber I39 through anelongated opening I83. The piston I58 is resiliently mounted within thebearing I59 upon a spring I 64 held between the end of the piston I58and a cap I66 secured in the bearing member I59 opposite the. pistonI58. The spring I64 tends resiliently to retain the ball I59 tightlywithin the cylindrical opening I6I. It will be apparent that thespherical bearing member I59, the piston I 58, and the rotor I53 arefree to move laterally within the metering pump chamber I39 away fromthe wall or inner surface I54 of the end plate 6|. However, the spring97 will tend to support the shaft I9 in such manner as to resilientlyoppose such movement and in such event the rotor I53 will normally bemovable in a circular path against the surface I54 of the end plate 6 I.Since spherical bearing member I59 and rotor I53 are free to oscillate,piston I58 will reciprocate within cylinder I5'I upon movement of rotorI53. In order to render the metering pump 54 operative during therotation of the shaft I9 and the rotor I53, the cylinder I5'I formedwithin the rotor I53 is provided with a port I6'I which is adapted tomove in a circular path upon the wall I 54 during the movement of therotor I53 by the shaft I9. The port I6! is adapted to communicate withthe metering pump inlet port I5I during the movement of the piston I 58outwardly with respect 91 to. the. cylinder I51 andctoj communicateiwithmeteringdischargeporttfifl whenthe; piston I58 moves inwardly withrespect. to; the. cylinder I51, The discharge. .port .188- communicatesthrough discharge passage [69' and-,conduit I1 I with the fuel supplypassage. I512. formed in. theoil burnernozzle. I83. It. will; be:apparent. that-the operation of the fuel metering: pump 54 willdischarge into the fuel-.supplypassage I112 of" the nozzle I83 measured.quantities or fuel: from the. fuel meter,- i-ng: pump chamber" I738.Also.,, it willbe noted that the. passages I52 and IE8 each. areconnected to anti-surge chambers I14 and; I18 respectively, thesechambers being at; all. times partly filled with air as: is indicatedvat I11 soas to dampen any pulsations inthes flow of the liquid receivedor delivered; by the metering pump The oilburner nozzle. I83 is disposedwithin a main air supply conduit. I18: which communicates with thecentrifugal fan located. within the fan housing I3 and driven by theshaft I'2z.. Thefan supplies to the conduit I18 the main air supply for;operating the oil burningapparatus. The nozzle. I88 is. locatedcentrally and axially within the air supply conduit I18 in such.mannerthat the air delivered. byr'thes fan. flow around the nozzle I83'toward the mixing "chamber end of the nozzle; which is indicated. bythenumeral I19. The mixing chamber. portion I.19 of the nozzle I83comprises an annular chamber I8I for receivingv air fronr the airsupply'passage H2" and a cylindrical: chamber I82 for receiving fuelfrom the fuel supply passage I112. The chamber I82 is disposedinternally with respect. to the chamber I8I:. The endof the chamber I82terminates in a discharge orifice: I83 with which chamber I82communicates. through a frusto-conical vmixing passage: I'84.. The:passage; I84; is supplied with fuel from the chamber." I382 by spirallyformed passageslafi.

During operation. of the :oil burning apparatus, it will; be apparentthatv a. 'main air supply will be delivered. to the nozzle-103' by the.conduit I18, and that the pumping; unit II will supply measuredquantities of liquidfueland air to the chambers I82. and I8JIrespectively. The adjustment of the by-pass I- M and: the: adjustment:of the meter-- ing pump 54-. is such. that the air: and fuel will bedelivered. respectively'to: the chambers [BI and I82 at about the samepressures. The discharge orifice I83 will therefore discharge into. theair flowing within. the conduit I18 a relatively rich mixture of fuel.and primary air. Such mixture when discharged from the, orifice I83 isadapted to be ignited by an igniter I86 comprising a pair of electrodes.I81 positioned adjacent the orifice I83.. The rich mixture so ignited bythe ignitor I88 will burn within. the main air supply supplied by the.conduit I18 and. beyond the'end of air cone ornozzle I89 which isprovided at the end of the conduit I18 andxbeyondi the discharge orificeI83. I

It will be noted that the. fuel. supply conduit ITI is provided withasolenoid actuated control valve indicated at I9 I. The valve I9!comprises an armature I92 disposed within the solenoid I93 and. adaptedto open and close a needle valve I94 with respect to an orifice I99formed in a valve casing I95 which is connected within the-conduit IN.The electrical circui-tfor'operating the solenoid I88 is connectedinparallel with the running windings for the motor employed in theapparatus I8 by a centrifugally actuated switch I91 which is operated bythe motor shaft I98. The switch I91 comprises a bracket I99 secured 10rigidly to the shaft I98 which abuts one end ofa spring 28I disposed:about the shaft I98 and the opposite end of which engages an axiallymovable ring 282 also disposed about the shaft I98. The ring 292 underinfluence of spring 28I- reacts on switch element 288to close thecircuit through the running windings for the motor. L-shaped leverweights 288, which are adapted to fulcrum about points 288 formed at theends of supports 281 projecting laterally with respect to the bracketIE'I-B reach on ring 282, under the influence of. centrifugal force toshift ring 2% against spring 28I to open the circuit through the runningwindings when the motor has attained its normal operating speed. Thering 282 engages a-switch element 288 at 289, theswitch element 288being secured to-a casing 2H of the motor of the oil burning apparatusI8 as. is. indicated at H2. The opposite end of the switch element 288carries a pair of contacts indicated at 2I3- adapted in oneposition toengage a con tact 2 I I andin another to engage a contact 218. In theposition in which the elements of the centrifugal switch I91 are.illustrated in Fig. 8, the motor shaft I98 has attained normal operatingspeed and under suohconditions the solenoid atcuated valve I91 is opento allow fluid to flow from the metering pump 54 throughthe conduit illto the fuel compartment I82. However, before the shaft I98 has reachedsuch normal .operating speed and. after the controls of the oil burningapparatus have been actuatedin such manner as to reduce the speed of theshaft I93 below normal-operatingspeed the ring 282 will be moved by thespring 28I away from the bracket E88 and in such manner as to move theswitch element 288 to break the. circuit between contacts 2I3 and 2I4and to make. an electrical circuit betweemthe contacts 2t? and 2H5,Under such circumstances it will be apparent that the solenoid;actu-ated valve IBI will operate to close the flow of fuel through thepassage ill by closing the needle valve. 94111301 1 the orifice I98. Theswitch I91 therefore will not permit the flow of fuel from the meteringpump Mtothe nozzle I88, except when the shaft I98 of the motor of theoil burning apparatus III is operating at a predetermined: or normalspeed. However, since the motor shaft I98 operates the fan shaft I2 andthe pumping unit shaft I9, it will be apparent that the fuel'meteringpump 54, the fuel supply pump 58, and the air pump 38 will be operatedbothbefore and after the motor shaft I98 reaches such predetermined ornormal opcrating speed and the centrifugal switch I91 is actuated insuch manner as to open the solenoid actuated valve I9I. Under suchcircumstances the air from theair pump 38. will continue to be deliveredthrough the orifice I8-8,.but the closing of-the valve ls lywill preventa normal how of fuel from the passages I88 into: the mixing passage IiSl; Under such circumstances the pressure will; rise the oilsupply-conduit I'II to such an extent that the fluid'pressure betweenthe rotor 1:83 and the wall I 54a will force the rotor I89away from thewall Itdjtoi an; extent great enoughto relieve the? pressure in theconduit Ill. The. rotor IE9, is movable in response to such increase-inpressure within the conduit MI by mason of the fact thatitis: possiblefor both the rotor. its: and the'piston 5-58. to move axially withtheshaft I8 within the metering pump chamber I38. Such axial movementisprovided for by movementof the shaft I39 withing the coupling I8 andagainst the; compression of the spring 91, the universal connectionsbetween the shaft I9 and air pump rotor 46 and gear pump 53 permittingsuch axial movement of shaft 19.

This application is a continuation of my copending application SerialNo. 13,718 for Oil Burner Pumping Unit, filed March 8, 1948, nowabandoned.

While I have illustrated and described a preferred embodiment of myinvention, it is understood that this is capable of modification, and Itherefore do not wish to be limited to the precise details set forth,but desire to avail myself of such changes and alterations as fallwithin the purview of the following claims.

I claim:

1. An oil burning apparatus including a driving shaft and a fuel and airpumping unit, said pumping unit comprising a casing having a supportextending thereacross and a plurality of guides, bearing means disposedon opposite sides of said support, a driven shaft extending within saidcasing and across said support and being rotatably mounted within saidbearings, fuel and air pumping means disposed on opposite sides of saidsupport in driven relation to said shaft, said fuel and air pumpingmeans being mounted within said casing in engagement with said guides,means for securing said fuel and air pumping means against the oppositesurfaces of said support, fuel metering means secured to said fuelpumping means within said casing, said fuel metering means being drivenby said shaft and being operatively associated with the discharge sideof said fuel pumping means, and means for securing said pumping unit tosaid oil burning apparatus with said shaft of said pumping unit inoperative relation to said driving shaft of said apparatus.

2. An oil burning apparatus including a driving shaft and a fuel and airpumping unit, said pumping unit comprising a casing having a supportextending thereacross and a plurality of guide rails extending radiallyinwardly thereof, bearing means disposed on opposite sides of saidsupport, a driven shaft extending within said casing and across saidsupport and being rotatably mounted within said bearings, fuel and airpumping means disposed on opposite sides of said support in drivenrelation to said shaft, said fuel and air pumping means being mountedwithin said casing in peripheral engagement with said guide rails, meansfor securing said fuel and air'pumping means against the oppositesurfaces of said support, and means for securing said support to saidoil burning apparatus with said shaft of said pumping unit in operativerelation to said driving shaft of said apparatus.

3. An oil burning apparatus including a driving shaft and a fuel and airpumping unit, said pumping unit comprising a casing having a supportextending thereacross and a plurality of guide rails extending radiallyinwardly thereof. bearing means disposed on opposite sides of saidsupport, a driven shaft extending within said casing and across saidsupport and being rotatably mounted within said bearings, fuel and airpumping means mounted on opposite sides of said support and being drivenby said shaft, said fuel and air pumping means being mounted within saidcasing in peripheral engagement with said guide rails and means forsecuring said pumping unit to said oil burning apparatus with said shaftof said pumping unit in operative relation to said driving shaft of saidapparatus.

4. An oil burning apparatus including a driving shaft and anoil and airpumping unit, said pumping unit comprising a hollow'casing having asupport extending transversely thereof intermediate the ends thereof,oil and air pumping means disposed on opposite sides of said support,means for securing said oil and air pumping means to said support,bearing means disposed on opposite sides of said support and carried bysaid oil and air pumping means, said support having an aperture thereinforming a seal chamber, a driven shaft extending'through said apertureand rotatably mounted within said bearings, said oil and air pumpingmeans being arranged in driven relation to said shaft, and a runningseal arranged in said chamber and around said shaft and forming arunning seal between said shaft and said support, part of saidsupportbeing exposed to the exterior of said casing, said support beingprovided with ducts forming passages communicating with the inlet anddischarge sides of said oil and air pumping means and terminating'in theouter surface of said casing whereby oil and air lines of the oilburning apparatus may be connected in fluid flow relation with said oiland air pumping means, said aperture forming a part of one of saidpassages, said seal being disposed between said oil and air pumpingmeans so as to prevent leakage of oil along said shaft into said airpumping means. 7

5. An oil burning apparatus including a driving shaft and an oil and airpumping unit, said pumping unit comprising a hollow tubular casinghaving a support extending transversely thereof, oil and air pumpingmeans disposed on opposite sides of said support, means for securingsaid oil and air pumping means to said support, bearing means disposedon opposite sides of said support and carried by said oil and airpumping means, said support having an aperture therethrough, a drivenshaft extending through said aperture and rotatably mounted within saidbearings, said oil and air pumping means being arranged in drivenrelation to said shaft, oil metering means secured to said oil pumpingmeans within said casing, said oil metering means being driven by saidshaft and being operatively associated with the discharge side of saidoil pumping means and a running seal arranged in said aperture andaround said shaft and forming a seal between said shaft and saidsupport, said seal being disposed between said oil and air pumping meansso as to prevent leakage of oil along said shaft into said air pumpingmeans.

6. An oil burning apparatus including a driving shaft and a fuel and airpumping unit, said pumping unit comprising a hollow tubular casinghaving a suport extending transversely thereof, fuel and air pumpingmeans disposed on opposite sides of said support, means for securingsaid fuel and air pumping means against the opposite sides of saidsupport, bearing means disposed on opposite sides of said support andcarried by said fuel and air pumping means, said support having anaperture therethrough, said driving shaft extending through saidaperture and being rotatably mounted within said bearings, said fuel andair pumping means being arranged in driven relation to said shaft, fuelmetering means within said casing, said fuel metering means including apump element driven by said shaft and being operatively associated withthe discharge side of said fuel pumping means, a block against whichsaid pump element is adapted to move during opera- 13 I tion of saidmetering means, said block having duct communicating with said dischargeside of said fuel pumping means, said pump element having a port adaptedto be brought into and out of registry with said duct during operationof said metering means, and ball arranged in a socket in said pumpelement and a socket in the end of said shaft, said ball providing auniversal connection between said shaft and pump element for maintaininga sealing engagement between said pump element and said block.

7. An oil burning apparatus including a driving shaft, an oil supplypump mounted on said shaft and including a rotary element having adriving connection with said shaft adapted to permit axial movement ofsaid shaft relative thereto, an oil metering pump arranged at the end ofsaid shaft and including a pump element having a universal connectionwith said shaft and adapted to be driven thereby, a block having alapped face and an oil duct terminating at one end in said face, saidduct at its other end communicating with the discharge side of said oilsupply pump, said pump element having a lapped face seated against thelapped face of said block and a port adapted to be brought into and outof registry with said duct in said block upon operation of said meteringpump, said universal connection between said shaft and pump elementcomprising a ball arranged in a socket in said pump element and a socketin the end of said shaft, and spring means reacting on said shaft, ball,and pump element for resiliently holding the lapped face of the later insealing relation with the lapped face of the block.

8. Oil burning apparatus according to claim "I wherein said rotaryelement of said oil supply pump is provided with an axially extendinggroove, said shaft having a depression therein, said driving connectionbetween said shaft and rotary element comprising a ball projecting intosaid depression and into said groove so as to provide a universalconnection between said shaft and said rotary element.

. 9. An oil burning apparatus including a driving shaft, an air supplypump mounted on said shaft and having a driving connection therewithadapted to permit axial movement of said shaft relative to said airpump, an oil supply pump mounted on said shaft and having a drivingconnection therewith adapted to permit axial movement of said shaftrelative to said oil supply pump, an oil metering pump arranged at theend of said shaft and including a pump element having a universalconnection with said shaft and. adapted to be driven thereby, a blockhaving a lapped face and an oil duct terminating in said face, said pumpelement having a lapped face seated against the lapped face of saidblock and a port adapted to be brought into and out of registry withsaid duct in said block upon operation of said metering pump, saiduniversal connection between said shaft and pump element comprising aball arranged in a socket in said pump element and a socket in the endof said shaft, and spring means reacting on said shaft, ball, and pumpelement for resiliently holding the lapped face of the latter in sealingrelation with the lapped face of the block.

10. An oil burning apparatus including a driving shaft, an air supplypump mounted on said shaft and including a rotor through which saidshaft extends, a driving connection between said rotor and said shaft,and oil supply pump mounted on said shaft and having a rotary elementthrough which said shaft extends, said rotary element having an axialslot therein, said shaft having a concave depression therein, a balldriving member arranged in said slot and said depression in said shaftso as to provide a universal driving connection between said shaft andsaid rotary element thereby permitting relative axial movement betweensaid shaft and said rotary element, a fuel metering pump having a drivenelement arranged at the end of and connected to said shaft so as to bedriven thereby, a block against Which said driven element of saidmetering pump is adapted to move and seat during operation thereof, aball arranged between the end of said shaft and said driven element, andspring means operable for biasing said shaft, ball, and driven elementtoward said block, said ball providing a universal connectionbetween'said shaft and said driven element for seating said drivenelement against said block.

11. An oil burnin apparatus including a driving shaft, an air supplypump mounted on said shaft and including a rotor through which saidshaft extends, a driving connection between said rotor and said shaft,an oil supply pump mounted on said shaft and having a rotary elementthrough which said shaft extends, said rotary element having an axialslot therein, said shaft having a concave depression therein oppositesaid slot, a ball driving member arranged in said slot and saiddepression in said shaft so a to provide a universal driving connectionbetween said shaft and said rotary element, a fuel metering pump havinga driven element arranged at the end of and connected to said shaft soas to be driven thereby, a block against which said driven element ofsaid metering pump is adapted'to move and seat during operation thereof,a ball arranged between the end of said shaft and said driven element,said ball providing at least a part of a universal connection betweensaid shaft and said driven element.

12. Apparatus according to claim 5 wherein said shaft is movable axiallyrelative to its bearings and to said oil and air pumping means andwherein a universal driving connection is provided between said shaftand said oil and air pumping means.

13. Apparatus according to claim 5 wherein said metering pump isarranged at one end of said shaft in driven relation therewith and so asto take axial thrust of said shaft, and wherein said seal includes aspring biasing said shaft towards said metering pump.

14. Apparatu according to claim 5 wherein said metering pump is arrangedat one end of said shaft and a ball provides a universal drivingconnection and thrust member between said shaft and said meterin pump.

ROBERT R. WITHERELL.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,868,161 Dilg July 19, 19321,878,736 Vickers sept. 20, 1932 1,986,003 Lum Jan. 1, 1935 2,312,886Ellinwood Mar. 2, 1943 2,383,092 Wahlmark Aug. 21, 1945 2,412,383 BakerDec. 10, 1946 2,413,035 DeLancey Dec. 24, 1946 2,495,685 Beaman et alJan. 31, 1950 ,5 8,982 Roosa Jan. 23, 1951

